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Three people pull simultaneously on a stubborn donkey. Jack pulls directly ahead of the donkey with a force of 93.9 N, Jill pulls with 78.3 N in a direction 45° to the left, and Jane pulls in a direction 45° to the right with 185 N. (Since the donkey is involved with such uncoordinated people, who can blame it for being stubborn?) Find the magnitude of the net force the people exert on the donkey.
___N
What is the direction of the net force? Express this as the angle from straight ahead between 0° and 90°, with a positive sign for angles to the left and a negative sign for angles to the right.
____
What is the pH of a solution obtained by mixing 50mL of 0.02 M sodium acetate with 40mL of 0.01 M HCl.
Problem- The principal component of many kidney stones is calcium oxalate, CaC2O4. A kidney stone recovered from a typical patient contains 8.5 x 10^20 formula units of calcium oxalate. How many moles of CaC2O4 are present in this kidney stone
A buffer is prepared by adding 5. g of ammonia, NH3, and 20.0g of ammonium chloride, NH4Cl, to enough water to form 2.50 L of solution.
The following reaction proceeds in two parts. The first part produces an intermediate compound A and byproduct HCOO-. The product of the second part is a bicyclic ?,?-unsaturated carbonyl compound.
Describe the nature and characteristics of PCB's. Why are they of importance to an EH&S or FS professional who encounters them when coming upon an incident scene where they are present? What precautions, or actions, should the EH&S or FS professio..
The enthalpy of combustion of n-Butanol, and the enthalpies of formation of CO2(g) and H2O(l), are shown below. Use the information given to calculate the enthalpy of formation of n-Butanol
Explore the effects of acid rain pre and post the 1990 Clean Air Act. Pair up and choose one of the topics listed below. One person should research and report on the damage that was being observed due to acid rain prior to 1990.
Assume that the volume remains constant when the base is added. my pKa is 4.34, mol HA is 0.302, my concentration ratio is 0.51, but how do I get moles of strong base initially added
If 10.0 mL of 0.00200 M KNCS is mixed with a very large excess of Fe(NO3)3, how many moles of FeNCS2+ product should form
After 79.0 min, 35.0% of a compound has decomposed. What is the half-life of this reaction assuming first-order kinetics
A pt has a blood Ca level of 4.6 mEq/L If 1mol Ca2+= Eq Ca2+ what is the blood calcium levle in mg/dl
how much heat in is required to warm 10.0 of ice initially at -11.0 to steam at 111.0? the heat capacity of ice is
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